Delete has no effect

[Misco]

Using Contao 4.13 in a own DCA with this config:

`$GLOBALS['TL_DCA']['tl_member']['fields']['video_vorschau'] = [
'label' => ['Video Vorschaubild', ''],
'exclude' => true,
'inputType' => 'fineUploader',
'eval' => [
'multiple' => false,
'storeFile' => true,
'uploadFolder' => 'files/Videos auf Detailseite/Vorschaubilder',
'useHomeDir' => false,
'uploaderLimit' => 1,
'maxConnections' => 1,
'addToDbafs' => true,
'doNotOverwrite' => true,
'debug' => true,

    // Validation
    'extensions'        => 'jpg,jpeg,png,webm',
    'minlength'         => 0,
    'maxlength'         => 2048000,
    
    // Chunking
    'chunking'          => false,

    // Rendering
    'isGallery'         => true,
    'isDownloads'       => false,
    'sortable'          => false,
    'uploadButtonTitle' => '',

    'directUpload'      => true,
],
'sql' => "blob NULL"

];`

When i click the red cross, the entry goes away, but the file remains.
What can i do? Thanks